400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
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  • 911 Q&As
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Simulation of 400 101 ccie practice exam materials and bible for Cisco certification for IT learners, Real Success Guaranteed with Updated exam 400 101 pdf dumps vce Materials. 100% PASS CCIE Routing and Switching (v5.0) exam Today!

Q341. Which congestion-avoidance or congestion-management technique can cause global synchronization? 

A. Tail drop 

B. Random early detection 

C. Weighted random early detection 

D. Weighted fair queuing 

Answer:

Explanation: 

Tail Drop 

Tail drop treats all traffic equally and does not differentiate between classes of service. Queues fill during periods of congestion. When the output queue is full and tail drop is in effect, packets are dropped until the congestion is eliminated and the queue is no longer full. 

Weighted Random Early Detection 

WRED avoids the globalization problems that occur when tail drop is used as the congestion avoidance mechanism on the router. Global synchronization occurs as waves of congestion crest only to be followed by troughs during which the transmission link is not fully utilized. Global synchronization of TCP hosts, for example, can occur because packets are dropped all at once. Global synchronization manifests when multiple TCP hosts reduce their transmission rates in response to packet dropping, then increase their transmission rates once again when the congestion is reduced. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfconav.ht ml#wp1002048 


Q342. Refer to the exhibit. 

Video Source S is sending interactive video traffic to Video Receiver R. Router R1 has multiple routing table entries for destination R. Which load-balancing mechanism on R1 can cause out-of-order video traffic to be received by destination R? 

A. per-flow load balancing on R1 for destination R 

B. per-source-destination pair load balancing on R1 for destination R 

C. CEF load balancing on R1 for destination R 

D. per-packet load balancing on R1 for destination R 

Answer:

Explanation: 

Per-packet load balancing guarantees equal load across all links, however potentially the packets may arrive out-of-order at the destination as differential delay may exist within the network. 

Reference: http://www.cisco.com/en/US/products/hw/modules/ps2033/prod_technical_reference09186 a00800afeb7.html 


Q343. Which two statements about MPLS VPNs are true? (Choose two.) 

A. PE routers maintain customer routes in the VPN for that customer. 

B. They use the explicit-null label by default. 

C. P routers are used only for label transit. 

D. P routers maintain customer routes in the VPN for that customer. 

E. They support only one route target. 

F. Each interface on a PE router must have its own VRF. 

Answer: A,C 


Q344. DRAG DROP 

Drag and drop each PHB on the left to the functionality it performs on the right. 

Answer: 


Q345. DRAG DROP 

Answer: 


Q346. Which IP SLA operation type is enhanced by the use of the IP SLAs Responder? 

A. DNS 

B. HTTP 

C. ICMP Echo 

D. UDP Echo 

Answer:

Explanation: 

Figure 1. UDP Echo Operation 

Response time (round-trip time) is computed by measuring the time taken between sending a UDP echo request message from Device B to the destination device--Device A--and receiving a UDP echo reply from Device A. UDP echo accuracy is enhanced by using the IP SLAs Responder at Device A, the destination Cisco device. If the destination device is a Cisco device, then IP SLAs sends a UDP datagram to any port number that you specified. Using the IP SLAs Responder is optional for a UDP echo operation when using Cisco devices. The IP SLAs Responder cannot be configured on non-Cisco devices. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_udp_echo.html 


Q347. Refer to the exhibit. 

What is the PHB class on this flow? 

A. EF 

B. none 

C. AF21 

D. CS4 

Answer:

Explanation: 

This command shows the TOS value in hex, which is 80 in this case. The following chart shows some common DSCP/PHB Class values: 

Service 

DSCP value 

TOS value 

Juniper Alias 

TOS hexadecimal 

DSCP - TOS Binary 

Premium IP 

46 

184 

ef 

B8 

101110 - 101110xx 

LBE 

32 

cs1 

20 

001000 - 001000xx 

DWS 

32 

128 

cs4 

80 

100000 - 100000xx 

Network control 

48 

192 

cs6 

c0 

110000 - 110000xx 

Network control 2 

56 

224 

cs7 

e0 

111000 - 111000xx 

Reference: http://www.tucny.com/Home/dscp-tos 


Q348. Refer to exhibit. 

The router is unreachable using telnet. Which option is solution? 

A. Use an extended access list instead of standard access list. 

B. The transport output telnet command must be added. 

C. The VRF configuration must be completed. 

D. The “vrf-also” keyword must be added to the access-class configuration. 

Answer:


Q349. Which two options are benefits of EIGRP OTP? (Choose two.) 

A. It allows EIGRP routers to peer across a service provider without the service provider involvement. 

B. It allows the customer EIGRP domain to remain contiguous. 

C. It requires only minimal support from the service provider. 

D. It allows EIGRP neighbors to be discovered dynamically. 

E. It fully supports multicast traffic. 

F. It allows the administrator to use different autonomous system numbers per EIGRP domain. 

Answer: A,B 

Explanation: 

EIGRP Over the Top (OTP) allows EIGRP routers to peer across a service provider infrastructure without the SP’s involvement. In fact with OTP, the provider won’t see customer routes at all. EIGRP OTP acts as a provider-independent overlay that transports customer data between the customer’s routers. To the customer, the EIGRP domain is contiguous. A customer’s EIGRP router sits at the edge of the provider cloud, and peers with another EIGRP router a different location across the cloud. Learned routes feature a next hop of the customer router — not the provider. Good news for service providers is that customers can deploy EIGRP OTP with their involvement 

Reference: http://ethancbanks.com/2013/08/01/an-overview-of-eigrp-over-the-top-otp/ 


Q350. Which protocol uses a proprietary 2-byte Type field for multiple protocol support? 

A. HDLC 

B. PPP 

C. CHAP 

D. PAP 

Answer:


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